local modname=minetest.get_current_modname()

farming_grain.enlarge_drop = function(item_name,def)
--[[
insert new seed at beginning of drop table. calculate new rarity.

example:
farming_grain.enlarge_drop("default:grass_4",{items={"farming:seed_wheat"},rarity=8})
]]

  local tdrop=minetest.registered_nodes[item_name].drop.items -- get drop.items table of stored item
  local new_drop={def}

  -- new drop table
  if tdrop ~= nil then
    for i=1,#tdrop do
      new_drop[i+1]=tdrop[i]
    end
  end
  -- calculate new rarity for each element. if all seeds have same rarity then the first element will drop more often than following elements
  for i=1,#new_drop do
    new_rarity=2^(#new_drop-i)
    new_drop[i].rarity=new_rarity
  end
  -- grab old drop table
  local old_def=minetest.registered_nodes[item_name].drop
  old_def.items=new_drop
  -- override drop table
  minetest.override_item(item_name,{drop=old_def})
end


-- local functions
